Wilwood Caliper-FSL4R 1.25/1.25" Pistons, 1.25" Disc

Forged Superlite 4 Radial Mount

The Superlite 4R caliper series is the benchmark in asphalt short track, late model, modified and open wheel competition. It also enjoys prominence in a variety of road-race, rally and sport driving applications. The new FSL4R model series is the latest innovation to this Superlite family of calipers. It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes. The transfer tube has been replaced with two additional bleed screw assemblies which allow symmetrical piston bore models to be mounted either right or left in a leading or trailing position. Differential bore models still require left hand and right hand orientation, but no leading or trailing configuration is necessary.

The most noteworthy feature of all the FSL4R caliper models is the exceptional strength and reduced weight of the forging. With assembled weights just at 4.4 pounds, the caliper body design in itself is a product of computer generated solid modeling and stress analysis technology. Each caliper features closed end bridges with a radial transition down to the main body and piston bore housings. The elimination of machined steps and sharp shoulders in this critical area provides a measurable increase in overall body strength and resistance to deflection under load. Every FSL4R body is stress-flow forged from a premium grade aluminum alloy billet.

Specifications

Pistons

Piston Count: 4

Piston Area (in²): 2.46

Piston Type: Stainless

Dust Boot: No

 

Rotor Dimensions

Rotor Width (in): 1.25

Rotor Diameter(in): 14

 

Pad Dimensions

Pad Area (in²): 8.2

Pad Volume (in³): 4.9

 

Duty Rating & Material

Material: Aluminum

 

Colors & Finish

Color: Ano

Finish: Type III Ano

 

Mounting

Mount Center(in): 5.98

Mount Side: Universal

Mount Type: Radial

 

Rotor Compatibility

Rotor Width (in): 1.25

Maximum Rotor Width (in): 1.35

Minimum Rotor Width (in): 1.15

Maximum Rotor Diameter(in): 14

Minimum Rotor Diameter(in): 11.75

 

Piston Specifications

Piston 1 Bore (in): 1.25

Piston 2 Bore (in): 1.25

Total Piston Area (in²): 2.46

 

Brake Pad Specifications

Brake Pad Type 1: 7420

Brake Pad Type 2: N-A

Brake Pad Type 3: N-A

Total Pad Area (in²): 8.2

Total Pad Volume (in³): 4.9

 

Mounting Specifications

Mount Type: Radial

Mount Side: Universal

Mount Center(in): 5.98

Mount Hole Size(in): 0.39

Mount Height(in): 1.63

Inlet Thread Size: 1/8-27 NPT